Why did so many polytheistic people were converted into monotheism but the opposite way is so rare?

[President Punxsutawney Phil]

An interesting question is why has polytheism held strong in the Indian subcontinent?

Well to an extent this is an artificial discussion, because Hinduism especially on the philosophical end is pretty monotheistic.

Hinduism is to some extent hardly a unified religion anyway. Adherents can be monotheistic or polytheistic.

[President Punxsutawney Phil]

An interesting question is why has polytheism held strong in the Indian subcontinent?

Well to an extent this is an artificial discussion, because Hinduism especially on the philosophical end is pretty monotheistic.

Hinduism is to some extent hardly a unified religion anyway. Adherents can be monotheistic or polytheistic.

The Balinese form is monotheistic.

I've heard some Hindus in India are also monotheistic.